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Metal‐Rich Sulfides of Mixed Tantalum and Niobium: A New Chemical Concept

1992; Volume: 96; Issue: 11 Linguagem: Inglês

10.1002/bbpc.19920961107

0005-9021

Xaioqiang Yao, Greg Marking, Hugo F. Franzen,

Iron-based superconductors research

Abstract The structures of the metal‐rich sulfides of Nb and Ta are briefly reviewed, and it is suggested that the differences between the structures containing Nb and those containing Ta indicate the possibility of novel ternary compounds. The existence of four unique compounds of this type and their structures are discussed. The interplay of first‐order bonding energy and configurational entropy are shown to lead to a plausible explanation for the formation of the unsual materials. The explanation is supported with extended Hückel calculations and consideration of metal‐metal interactions scaled by the Pauling bondorder equation.